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© Research
Publication : Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases

Molecular epidemiology of extended-spectrum beta-lactamase-producing Klebsiella pneumoniae strains in a university hospital in Tunis, Tunisia, 1999-2005

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases - 21 Sep 2009

Elhani D, Bakir L, Aouni M, Passet V, Arlet G, Brisse S, Weill FX

Link to Pubmed [PMID] – 19769601

Clin. Microbiol. Infect. 2010 Feb;16(2):157-64

During a period of 6 years and 5 months (January 1999 to May 2005), 103 extended-spectrum beta-lactamase (ESBL)-producing Klebsiella pneumoniae isolates, each from an individual patient or site, were collected at Mongi Slim University Hospital Centre, Tunis, Tunisia. The objectives of our work were the characterization of the bla genes encoding ESBLs, the investigation of clonal diversity of strains, and identification of the transmission modes of the resistance genes. We carried out detection by PCR and sequencing of the bla(SHV), bla(CTX-M) and bla(TEM) genes, transferability studies, plasmid replicon typing, and analysis by multilocus sequence typing (MLST) on selected isolates. Forty-seven isolates were found to be producers of CTX-M-type ESBLs, of which 43 were CTX-M-15, two CTX-M-14 and two CTX-M-27. Fifty-eight isolates were producers of SHV-12, and three were producers of SHV-2a. More than one ESBL was detected in seven isolates, as five produced both CTX-M-15 and SHV-12, and two produced both CTX-M-27 and SHV-12. By a PCR-based replicon typing method, the plasmids carrying the bla(SHV-2a) or bla(CTX-M-15) genes were assigned to IncFII or, more rarely, to IncL/M types. Of 12 plasmids carrying the bla(SHV-12) gene, only one could be typed: it was positive for the HI2 replicon. The MLST results showed large genetic background diversity in the SHV-12-producing isolates and dissemination of specific clones of the CTX-M-15-producing isolates within the same ward and among wards, and suggested endemicity with horizontal dissemination of the bla(CTX-M-15) and the bla(SHV-12) genes.

http://www.ncbi.nlm.nih.gov/pubmed/19769601